JSFiddle - React, Tailwind, and code Playground

HTML

<script type="text/javascript" src="http://docs.sencha.com/extjs/4.2.1/extjs-build/examples/direct/php/api.php"></script>

JavaScript

Ext.require([
    'Ext.direct.*',
    'Ext.panel.Panel',
    'Ext.form.field.Text',
    'Ext.toolbar.TextItem'
]);

Ext.onReady(function(){
    
    function doEcho(field){
        TestAction.doEcho(field.getValue(), function(result, event){
            var transaction = event.getTransaction(),
                content = Ext.String.format('<b>Successful call to {0}.{1} with response:</b><pre>{2}</pre>',
                    transaction.action, transaction.method, Ext.encode(result));
            
            updateMain(content);
            field.reset();
        });
    }
    
    function doMultiply(field){
        TestAction.multiply(field.getValue(), function(result, event){
            var transaction = event.getTransaction(),
                content;
                
            if (event.status) {
                content = Ext.String.format('<b>Successful call to {0}.{1} with response:</b><pre>{2}</pre>',
                    transaction.action, transaction.method, Ext.encode(result));
            } else {
                content = Ext.String.format('<b>Call to {0}.{1} failed with message:</b><pre>{2}</pre>',
                    transaction.action, transaction.method, event.message);
            }
            updateMain(content);
            field.reset();
        });
    }
    
    function updateMain(content){
        main.update({
            data: content
        });
        main.body.scroll('b', 100000, true);
    }
    
    Ext.direct.Manager.addProvider(Ext.app.REMOTING_API, {
        type:'polling',
        url: 'http://docs.sencha.com/extjs/4.2.1/extjs-build/examples/direct/php/poll.php',
        listeners: {
            data: function(provider, event){
                updateMain('<i>' + event.data + '</i>');
            }
        }
    });
    
    var main = Ext.create('Ext.panel.Panel', {
        // The id is used for styling
        id: 'logger',
        title: 'Remote Call Log',
        renderTo: document.body,
		width: 600,
		height: 300,
     ...